SRS Symbol Allocation for Uplink Collision Avoidance
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Solution Overview
Problem
In the context of New Radio (NR) communication systems, the increased number of symbols for SRS transmission can cause collisions with other uplink channels, such as PUSCH and PUCCH, leading to reliability issues and interference with other UEs, while the lack of channel state measurement methods in unused bandwidth parts (BWP) affects communication reliability between UEs and base stations.
Innovation Solution
The system allocates specific symbol ranges before and after the SRS for uplink communication, allowing UEs and base stations to perform uplink communication without interfering with SRS transmission, and provides advanced notification of SRS configurations to UEs to avoid collisions and ensure reliable channel state measurement across all frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of symbols for SRS transmission is increased, then the channel state measurement capability is improved, but the collision probability with other uplink channels (PUSCH, PUCCH) increases
Solution Approach 1:
The slot is divided into distinct symbol ranges: an SRS symbol range allocated for sounding reference signal transmission, and a first uplink symbol range for uplink communication. This segmentation prevents collisions between SRS and uplink channels by assigning dedicated time resources to each function within the slot.
Solution Approach 2:
The base station performs preliminary actions by notifying the terminal device of the SRS configuration in advance. The terminal device uses this advance information to determine the SRS symbol range and accordingly schedules its uplink transmissions in the first uplink symbol range, avoiding collisions before they occur.
2Measurement precision
If the SRS symbol range is expanded, then the channel state measurement accuracy is improved, but the interference with other UEs' uplink communication increases
Solution Approach 1:
The time resources within the slot are segmented into an SRS symbol range for one UE's channel state measurement and a first uplink symbol range for other UEs' uplink communication. This segmentation allows accurate SRS measurement while preventing interference with other UEs by ensuring their uplink transmissions occur in different time intervals.
Solution Approach 2:
The base station acts as an intermediary that coordinates between the terminal device requiring channel state measurement and other terminal devices needing uplink communication. By notifying the terminal device of the SRS configuration and having it report the first uplink symbol range, the base station mediates the time resource allocation to avoid mutual interference.
3Reliability
If dynamic indication of SRS configuration is provided, then the collision avoidance capability is improved, but the signaling overhead increases
Solution Approach 1:
The base station performs preliminary action by notifying the terminal device of the SRS configuration in advance through downlink control information. This advance notification allows the terminal device to determine the SRS symbol range and schedule uplink transmissions accordingly, achieving collision avoidance without requiring continuous dynamic signaling during the transmission period.
Data Source
AI summary
A user apparatus in a communication system includes: a plurality of user apparatuses each of which is configured to transmit a sounding reference signal (SRS); and a base station configured to wirelessly communicate with the plurality of the user apparatuses. The user apparatus receives, from the base station, configuration information related to a wireless resource of the sounding reference signal allocated to another user apparatus.